Pereira, R. G.; Marquez, B. F.; Hallberg, K.; Bauer, T.; Egger, R.: Tunneling spectroscopy of the spinon-Kondo effect in one-dimensional Mott insulators. Physical Review B 113 (2026), p. 045402/1-9
10.1103/wkmx-772j
Open Accesn Version
(available 01.01.2027)Abstract:
We study the tunneling density of states (TDOS) in one-dimensional (1D) Mott insulators at energies below the charge gap. By employing nonlinear Luttinger liquid theory and density-matrix renormalization group (DMRG) simulations, we predict that in the presence of a magnetic impurity at the boundary, characteristic Fermi-edge singularity features can appear at subgap energies in the TDOS near the boundary. In contrast to the Kondo effect in a metal, these resonances are strongly asymmetric and of power-law form. The power-law exponent is universal and determined by the spinon-Kondo effect.